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FAST REVISION
Physiology
Sympathetic activity enhances sodium and water reabsorption in the PCT (proximal convoluted tubule) through increased activity of sodium pumps and sodium-potassium-2-chloride cotransporters, which helps in fluid and electrolyte retention.
General Medicine
Nitroglycerin is a vasodilator that primarily acts by relaxing vascular smooth muscles, which leads to dilatation of coronary arteries.